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  <a name="ZH-CN_TOPIC_0000001792342922"></a><a name="ZH-CN_TOPIC_0000001792342922"></a>
  <h1 class="topictitle1">（可选）创建备份存储单元组</h1>
  <div>
   <p>备份存储单元主要用于备份时，手动设置备份副本的存储位置，如果您需要自动切换备份副本存储位置，或者复制时自动设置复制副本存储位置，请执行本节操作创建备份存储单元组。</p>
   <div class="section">
    <h4 class="sectiontitle">前提条件</h4>
    <ul>
     <li>创建备份存储单元组时，至少存在两个状态正常的备份存储单元，且至少需要选择一个本地集群的备份存储单元。</li>
     <li>如果需要使用外接设备的备份存储单元创建备份存储单元组，就需要在创建备份存储单元组时打开<span class="uicontrol">“并行数据存储”</span>开关。</li>
    </ul>
   </div>
   <div class="section">
    <h4 class="sectiontitle">注意事项</h4>
    <ul>
     <li>创建备份存储单元组时，不能选择同一备份存储设备的存储单元。</li>
     <li>创建或修改备份存储单元组时，仅GaussDB(DWS)支持并行数据存储。在创建SLA时，不支持并行数据存储的应用将不可选择此备份存储单元组作为副本存储位置。</li>
     <li>LAN-Free场景下存储策略不会生效。</li>
    </ul>
   </div>
   <div class="section">
    <h4 class="sectiontitle">操作步骤</h4>
    <ol>
     <li><span>选择<span class="menucascade" id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_menucascade31053579148">“<span class="uicontrol" id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_uicontrol41059577142"><span id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_text1054020121612">系统</span></span> &gt; <span class="uicontrol" id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_uicontrol154661958121418"> <span id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_text8757278167">基础设施</span></span> &gt; <span class="uicontrol" id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_uicontrol54471544151"> <span id="ZH-CN_TOPIC_0000001792342922__zh-cn_topic_0000001839142053_text1631251418164">集群管理</span></span>”</span>。</span></li>
     <li><span>选择<span class="uicontrol">“<span>备份存储单元组</span>”</span>。</span></li>
     <li><span>单击<span class="uicontrol">“<span>创建</span>”</span>，创建备份存储单元组。相关参数说明如<a href="#ZH-CN_TOPIC_0000001792342922__table11753170204411">表1</a>所示。</span><p></p>
      <div class="tablenoborder">
       <a name="ZH-CN_TOPIC_0000001792342922__table11753170204411"></a><a name="table11753170204411"></a>
       <table cellpadding="4" cellspacing="0" summary="" id="ZH-CN_TOPIC_0000001792342922__table11753170204411" frame="border" border="1" rules="all">
        <caption>
         <b>表1 </b>创建备份存储单元组参数说明
        </caption>
        <colgroup>
         <col style="width:28.910000000000004%">
         <col style="width:71.09%">
        </colgroup>
        <thead align="left">
         <tr>
          <th align="left" class="cellrowborder" valign="top" width="28.910000000000004%" id="mcps1.3.4.2.3.2.1.2.3.1.1"><p>参数</p></th>
          <th align="left" class="cellrowborder" valign="top" width="71.09%" id="mcps1.3.4.2.3.2.1.2.3.1.2"><p>说明</p></th>
         </tr>
        </thead>
        <tbody>
         <tr>
          <td class="cellrowborder" valign="top" width="28.910000000000004%" headers="mcps1.3.4.2.3.2.1.2.3.1.1 "><p><span>名称</span></p></td>
          <td class="cellrowborder" valign="top" width="71.09%" headers="mcps1.3.4.2.3.2.1.2.3.1.2 "><p>自定义备份存储单元组的名称。</p></td>
         </tr>
         <tr>
          <td class="cellrowborder" valign="top" width="28.910000000000004%" headers="mcps1.3.4.2.3.2.1.2.3.1.1 "><p><span>描述</span></p></td>
          <td class="cellrowborder" valign="top" width="71.09%" headers="mcps1.3.4.2.3.2.1.2.3.1.2 "><p>填写备份存储单元组的描述。</p></td>
         </tr>
         <tr>
          <td class="cellrowborder" valign="top" width="28.910000000000004%" headers="mcps1.3.4.2.3.2.1.2.3.1.1 "><p><span>并行数据存储</span></p></td>
          <td class="cellrowborder" valign="top" width="71.09%" headers="mcps1.3.4.2.3.2.1.2.3.1.2 "><p>默认关闭。开启后，副本数据将存储到所有已选备份存储单元上，否则副本数据将存储到任务执行节点对应的备份存储单元上。</p>
           <div class="note">
            <span class="notetitle"> 说明： </span>
            <div class="notebody">
             <ul>
              <li>如果需要对GaussDB(DWS)进行备份，且需要使用外部备份存储单元，请开启“并行数据存储”。<span style="color:#282B33;">仅GaussDB(DWS)支持并行数据存储。在创建SLA时，不支持的应用将不可选择此备份存储单元组作为副本存储位置。</span></li>
              <li>开启并行数据存储后，需要至少选择一个属于本地集群的备份存储单元。</li>
              <li>关闭<span class="uicontrol">“<span>并行数据存储</span>”</span>后，仅可选择备份集群中的节点。</li>
             </ul>
            </div>
           </div></td>
         </tr>
         <tr>
          <td class="cellrowborder" valign="top" width="28.910000000000004%" headers="mcps1.3.4.2.3.2.1.2.3.1.1 "><p><span>故障超时时间</span></p></td>
          <td class="cellrowborder" valign="top" width="71.09%" headers="mcps1.3.4.2.3.2.1.2.3.1.2 "><p>指任务分发到备节点/成员节点时，如果备节点/成员节点故障，系统等待该节点重新恢复的时间。如果在故障超时时间内该节点未恢复，系统将切换其他节点执行任务。故障超时时间默认为15分钟。支持设置为1~120分钟。</p></td>
         </tr>
        </tbody>
       </table>
      </div> <p></p></li>
     <li><span>在<span class="uicontrol">“<span>可选备份存储单元</span>”</span>列表中勾选所有的备份存储单元，在<span class="uicontrol">“<span>已选备份存储单元</span>”</span>列表中设置告警阈值（默认的告警阈值为80%）。</span></li>
     <li><span>单击<span class="uicontrol">“<span>下一步</span>”</span>。</span></li>
     <li><span>确认存储策略。支持<span class="uicontrol">“<span>缩减率优先</span>”</span>或<span class="uicontrol">“<span>智能均衡</span>”</span>两种存储策略。请根据实际业务需求进行选择。</span><p></p>
      <ul>
       <li><span>缩减率优先</span>：该模式优先保证数据缩减率，会优先使用首次备份的存储单元。如果节点故障或ProtectAgent网络故障，会根据策略算法进行存储单元切换。</li>
       <li><span>智能均衡</span>：每次全量备份，系统根据存储集群的容量/任务负载通过算法自动选择最优的存储单元。</li>
      </ul> <p></p></li>
     <li><span>单击<span class="uicontrol">“<span>确定</span>”</span>。</span></li>
    </ol>
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